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CP violation and the fourth generation

Eilam, Gad; Trampetić, Josip; Melić, Blaženka (2009) CP violation and the fourth generation. Physical Review D, 80 (11). 116003-1-116003-11. ISSN 1550-7998

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Within the standard model with the 4th generation quarks b(') and t(') we have analyzed CP-violating flavor changing neutral current processes t -> cX, b(')-> sX, b(')-> bX, t(')-> cX, and t(')-> tX, with X=H,Z,gamma,g, by constructing and employing a global, unique fit for the 4th generation mass mixing matrix (CKM4) at 300 < m(t)(')< 700 GeV. All quantities appearing in the CKM4 were subject to our fitting procedure. We have found that our fit produces the following CP partial rate asymmetry dominance: a(CP)(b(')-> s(H,Z;gamma,g))similar or equal to(94,62;47,41)%, at m(t)(')similar or equal to 300,350 GeV, respectively. From the experimental point of view the best decay mode, out of the above four, is certainly b(')-> s gamma, due to the presence of the high energy single photon in the final state. We have also obtained relatively large asymmetry a(CP)(t -> cg)similar or equal to(8-18)% for t(') running in the loops. There are fair chances that the 4th generation quarks will be discovered at LHC and that some of their decay rates will be measured. If b(') and t(') exist at energies we assumed, with well executed tagging, large a(CP) could be found too.

Item Type: Article
Uncontrolled Keywords: top-quark decays; higgs-boson; symmetry-breaking; particle widths; qcd corrections; standard model; b decays; asymmetries; physics; transitions
Subjects: NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions: Theoretical Physics Division
Project titleProject leaderProject codeProject type
Fundamentalne interakcije u fizici elementarnih čestica i kozmologiji[3635] Nevenko Bilić098-0982930-2864MZOS
Nekomutativni prostori u fizici visokih energijaJosip Trampetić098-0982930-2900MZOS
Tools and Precision Calculations for Physics Discoveries at Colliders - HEPTOOLSUNSPECIFIED36252FP6
Depositing User: Blaženka Melić
Date Deposited: 29 May 2013 14:17
DOI: 10.1103/PhysRevD.80.116003

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